Staff at the National Mississippi River Museum & Aquarium in Dubuque discovered the tortoise named Cashew was missing Tuesday. The staff believes Cashew was taken between Sunday afternoon and Monday night.

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Museum officials are reviewing security tapes in the hopes of identifying a suspect.

Cashew was held in an enclosure that also had other tortoises. A museum official says the only way Cashew could get out was by someone climbing over a 4-foot glass wall and taking the animal.

Officials believe the tortoise was taken as a prank or to sell it. Cashew has special dietary needs, but the museum won't specify those details in the hopes the thief will return the animal.